Back rest for chairs



FIG. 1 is a front perspective view of the back rest for chairs according to the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top plan view thereof, the bottom view being a mirror image;

FIG. 5 is a side view thereof, the opposite side being a mirror image; and,

FIG. 6 is a rear perspective view thereof. 

CLAIM The ornamental design for back rest for chairs, as shown and described. 